scholarly journals Diffusion and Controlled Release in Physically Crosslinked Poly (Vinyl Alcohol)/Iota-Carrageenan Hydrogel Blends

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1544 ◽  
Author(s):  
Catalin Croitoru ◽  
Ionut Claudiu Roata ◽  
Alexandru Pascu ◽  
Elena Manuela Stanciu
Keyword(s):  
Vinyl Alcohol ◽  
Weight Ratio ◽  
Mesh Size ◽  
Strong Interactions ◽  
Poly Vinyl Alcohol ◽  
Release Rates ◽  
Antibiotic Drugs ◽  
Swelling Mechanism ◽  
Physically Crosslinked ◽  
Crystalline Domains

This paper reports the obtaining of poly (vinyl alcohol) and ι-carrageenan blend hydrogels by physical crosslinking (consecutive freeze–thaw cycles). The two polymers were completely miscible in the weight ratio interval used in this study, as determined by solution viscometry data. Strong interactions through hydrogen bonding and forming of mixed interpolymer crystalline domains were observed, which are responsible for the formation of stable drug release-tunable matrices. The release profiles of three model antibiotic drugs (amoxicillin, tetracycline hydrochloride, and gentamicin sulfate) were assessed in a pH interval between 3 and 7.3. They were found to be strongly dependent on the drug chemistry, mesh size of the hydrogels, swelling mechanism, and pH of the release medium. A decrease of up to 40% in the release rates and up to 10% in the diffusion coefficients of the model drugs was registered with the increase in ι-carrageenan content.

scholarly journals Physically Crosslinked Poly (Vinyl Alcohol)/Kappa-Carrageenan Hydrogels: Structure and Applications

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 560 ◽  
Author(s):  
Catalin Croitoru ◽  
Mihai Alin Pop ◽  
Tibor Bedo ◽  
Mihaela Cosnita ◽  
Ionut Claudiu Roata ◽  
...  
Keyword(s):  
Polymer Matrix ◽  
Diffusion Coefficients ◽  
Vinyl Alcohol ◽  
Weight Ratio ◽  
Poly Vinyl Alcohol ◽  
Distilled Water ◽  
Cationic Dye ◽  
Structure Morphology ◽  
Physically Crosslinked ◽  
Kappa Carrageenan

This paper discusses the structure morphology and the thermal and swelling behavior of physically crosslinked hydrogels, obtained from applying four successive freezing–thawing cycles to poly (vinyl alcohol) blended with various amounts of κ-carrageenan. The addition of carrageenan in a weight ratio of 0.5 determines a twofold increase in the swelling degree and the early diffusion coefficients of the hydrogels when immersed in distilled water, due to a decrease in the crystallinity of the polymer matrix. The diffusion of water into the polymer matrix could be considered as a relaxation-controlled transport (anomalous diffusion). The presence of the sulfate groups determines an increased affinity of the hydrogels towards crystal violet cationic dye. A maximum physisorption capacity of up to 121.4 mg/g for this dye was attained at equilibrium.

scholarly journals A facile method for synthesizing free-shaped and tough double network hydrogels using physically crosslinked poly(vinyl alcohol) as an internal mold

2010 ◽  
Vol 1 (5) ◽  
pp. 693 ◽  
Author(s):  
Tasuku Nakajima ◽  
Naoyuki Takedomi ◽  
Takayuki Kurokawa ◽  
Hidemitsu Furukawa ◽  
Jian Ping Gong
Keyword(s):  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Internal Mold ◽  
Double Network ◽  
Physically Crosslinked

scholarly journals Poly(vinyl alcohol): Physical Approaches to Designing Biomaterials for Biomedical Applications

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Shathani Nkhwa ◽  
Kristo Fernando Lauriaga ◽  
Evren Kemal ◽  
Sanjukta Deb
Keyword(s):  
Vinyl Alcohol ◽  
Biomedical Applications ◽  
Physical And Mechanical Properties ◽  
Poly Vinyl Alcohol ◽  
Biocompatible Polymers ◽  
Chemical Crosslinking ◽  
Biocompatible Polymer ◽  
Physical Methods ◽  
Physically Crosslinked ◽  
Physical Crosslinking

Poly(vinyl alcohol) is a non-toxic, biosynthetic polymer and biocompatible polymer that has the ability to form hydrogels either via chemical or physical crosslinking. Whilst chemical crosslinking provides greater control on the properties of the resultant hydrogel, physically crosslinked hydrogels or blends with other biocompatible polymers are more suited for biomedical applications. In this paper we report a systematic study on the effect of varying concentrations of PVA, physical methods of crosslinking, and PVA-gelatin and PVA-PVP blends on the physical and mechanical properties of the hydrogels.

Nanocomposite Films of Poly(vinyl alcohol)-Grafted Graphene Oxide/Poly(vinyl alcohol) for Gas Barrier Film Applications

2015 ◽  
Vol 15 (10) ◽  
pp. 8348-8352 ◽  
Author(s):  
Min Eui Lee ◽  
Hyoung-Joon Jin
Keyword(s):  
Graphene Oxide ◽  
Vinyl Alcohol ◽  
Transmission Rate ◽  
Barrier Properties ◽  
Nanocomposite Films ◽  
Strong Interactions ◽  
Poly Vinyl Alcohol ◽  
Gas Barrier ◽  
Oxygen Transmission Rate ◽  
Gas Barrier Properties

Poly(vinyl alcohol) (PVA) composites containing graphene oxide (GO) functionalized with PVA were synthesized via the esterification of the carboxylic groups of GO. The presence of PVA-grafted GO (PVA-g-GO) in the PVA matrix induced strong interactions between the chains of the PVA matrix and allowed the PVA-g-GO to be uniformly dispersed throughout the matrix. The grafting of PVA to GO increased the gas barrier properties of the GO/PVA composites because of the increased compatibility between GO and PVA. The PVA-g-GO/PVA composites were used to coat the surface of poly(ethylene terephthalate) films. These coated films exhibited excellent gas barrier properties; the film containing 0.3 wt% of PVA-g-GO had an oxygen transmission rate (OTR) of 0.025 cc/(m2 · day) and an optical transmittance of 83.8%. As a result, PVA-g-GO/PVA composites that exhibited enhanced gas barrier properties were prepared with a solution mixing method.

Swelling Kinetic Study of Poly(Vinyl Alcohol)/Poly(γ-Glutamic Acid) Blend Hydrogel

2015 ◽  
Vol 1095 ◽  
pp. 423-426
Author(s):  
Mian Mian Zhang ◽  
Yu Xi Chen ◽  
Xia Ma
Keyword(s):  
Glutamic Acid ◽  
Kinetic Study ◽  
Vinyl Alcohol ◽  
Diffusion Mechanism ◽  
Fickian Diffusion ◽  
Poly Vinyl Alcohol ◽  
Swelling Kinetics ◽  
Swelling Mechanism ◽  
Swelling Kinetic ◽  
Sensitive Property

In this article, the swelling behavior and swelling kinetic of poly (vinyl alcohol)/poly (γ-glutamic acid) hydrogel were investigated. It was found that the PGA/PVA hydrogels revealed the pH-sensitive property and exhibited a faster swelling at pH7.4. The study of swelling kinetics revealed that the swelling mechanism followed the non-Fickian diffusion mechanism.

scholarly journals Study on the Mechanical Properties of Palm Kernel Fibre Reinforced Epoxy and Poly-Vinyl Alcohol (PVA) Composite Material

2016 ◽  
Vol 7 ◽  
pp. 68-77 ◽  
Author(s):  
Osita Obiukwu ◽  
Ignatius Opara ◽  
Henry Udeani
Keyword(s):  
Mechanical Properties ◽  
Vinyl Alcohol ◽  
Palm Kernel ◽  
Weight Ratio ◽  
Tensile Modulus ◽  
Stress Transfer ◽  
Fibre Content ◽  
Poly Vinyl Alcohol ◽  
Resonant Amplitude ◽  
Coconut Fibre

The goal of this paper is to determine the mechanical properties of a proposed combined polymer composite which consist of a poly-vinyl alcohol (PVA) matrix and palm kernel fibre reinforced with epoxy. The influence of fibres volume on the mechanical properties of the composites was also evaluated. Composites with volumetric amounts of palm kernel fibre up to 12 % were fabricated and they were arranged in randomly oriented discontinues form. Tensile, impact, flexural and hardness tests were carried out to determine the characteristics of material. The acquired results show that the tensile modulus changes with the fibre content. The strength of coconut fibre reinforced composites tends to decrease with the amount of fibre which indicates ineffective stress transfer between the fibre and matrix. When higher fibre content of 10% was used, the damping peak shows the maximum value for almost all the frequency mode. It was observed that the effects of reinforcing poly-vinyl alcohol (PVA matrix with the palm kernel fibres caused the composites to be more flexible and easily deform due to high strain values and reduction of high resonant amplitude. In general, the mechanical properties of the developed composite showed variation at different test performed. This led to the conclusion that the material is most useful were strength to weight ratio is needed. The optimum percentage of fibre in epoxy resin to obtain the highest tensile properties was found at 10 vol. %. It was also found that fibre, dispersion of fibre and interfacial adhesion between fibre–matrix can affect the mechanical properties of the composites.

Tear force of physically crosslinked poly(vinyl alcohol) gels with different submicrometer-scale network structures

2014 ◽  
Vol 132 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
Taegu Noh ◽  
Yujiro Bando ◽  
Kensuke Ota ◽  
Saori Sasaki ◽  
Atsushi Suzuki
Keyword(s):  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Network Structures ◽  
Scale Network ◽  
Physically Crosslinked
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